JPH04120519A - Liquid crystal display panel - Google Patents

Abstract

PURPOSE:To prevent the generation of the line defects occurring in the disconnection of bus lines and to improve the yield of production by electrically interconnecting both ends of one set each of respective divided light shielding films and the bus lines nearest each other on the outside part of display regions. CONSTITUTION:Both ends of one set each of the respective divided black matrixes 17a to 17c, 74 and the bus lines A 14b to 14d, 72 nearest each other are electrically interconnected as interconnecting parts 19a to 19f, 75a on the outside part of the display regions 18. Currents are supplied from an external power source through the interconnecting part 75a-black matrix 74-interconnecting part 75b in the range shown by D on the left side from the disconnected part 73 of the bus line 72 when a disconnected part 73 shown by O is generated by the generation of a disconnection in the bus line 2. Consequently, the TFT elements connected to the range D of the bus line 72 are driven even if the disconnection arises. The generation of the line defect occurring in the disconnection of the bus line 72 is prevented and the yield of the production is improved.

Description

[Detailed description of the invention] 〔overview〕 Regarding liquid crystal display panels.

The purpose is to improve manufacturing yield by preventing line defects caused by bus line breaks.

It consists of a TFT substrate equipped with a pixel electrode, a TFT element, a scan canvas line and a data bus line for driving the TFT element, and a counter substrate on which a common electrode and a light shielding film are formed.

In an active matrix liquid crystal display panel in which liquid crystal is sealed between a TFT substrate and a counter substrate and sealed with a seal, the light-shielding film formed on the counter substrate is made of a conductive material and is electrically insulated from the common electrode. The TFT substrate is divided and formed in such a shape that there is no part facing one or both of the two types of bus lines included in the TFT substrate.
Each divided light-shielding film and the nearest lotus line are configured such that both ends thereof are electrically connected to each other outside the display area.

[Industrial application field]

The present invention relates to a liquid crystal display panel.

(Conventional technology) FIG. 9 is a diagram showing a conventional example.

1A shows a TFT substrate, FIG. 1B shows a counter substrate, and FIG. 1C shows a liquid crystal display panel in which the TFT substrate and the counter substrate are bonded together.

In FIG. 9, 81 is a TFT substrate, 82 is a pixel electrode,
83 is a TFT element, and 84 is a bus line A.

85 is a bus line B, 86 is a counter substrate, 87 is a black matrix, and 88 is an opening.

Active matrix type liquid crystal display panel.

(1) TFT element 83 for writing data to a designated pixel electrode 82. A scan bus line B85 for transmitting a scanning signal for selectively driving the TFT element 83 and a data bus line A84 for transmitting a data signal for driving the pixel electrode 82 are provided. and a TFT substrate 81 made of a transparent substrate such as glass.

(2) A common electrode made of a transparent conductive film such as ITO was formed. It is composed of a counter substrate 86 made of a transparent substrate such as glass, and (3) a liquid crystal sealed between the TFT substrate 81 and the counter substrate 86.

The counter substrate 86 includes (a) a color filter and a black matrix (light shielding film) 87;

(b) Consisting only of the black matrix 87.

The structure shown in (b) is used in a projection type liquid crystal display panel using a dichroic mirror.

The black matrix 87 prevents light leakage.

This is provided to improve the contrast, and T
An opening 88 having the same shape as the two pixel electrodes 82 is provided in a portion facing the pixel electrode 82 formed on the FT substrate 81 .

(Problems to be Solved by the Invention) A large number of bus lines are formed in the vertical and horizontal directions in a liquid crystal display panel to drive TFT elements.

As an example, a liquid crystal display panel having a display area of 6 inches diagonally has, for example, 960×240 bus lines.

The bus line is designed to increase the area occupied by one pixel.
It is necessary to form the width as narrow as possible. Therefore, it is extremely difficult to form a large number of bus lines as designed. In particular, disconnections are likely to occur.

FIG. 7 is a schematic diagram when a wire breakage occurs in a conventional example.

In the figure, 61 is a liquid crystal display panel, 62 is a bus line, and 63 is a disconnection part.

Now, a disconnection has occurred in the bus line 62, and the disconnection part 6 indicated by O
Suppose that 3 occurs. Then, the disconnection part 6 of the bus line 62
No current is supplied from the external power supply to the range indicated by D on the left side from 3. As a result.

The TFT elements connected to the area indicated by D on the bus line 62 are not driven, and therefore the pixels in this area become non-functional. This is a line defect.

LCD panels with line defects are considered defective, so
Line defects are one of the causes of lower manufacturing yields of liquid crystal display panels.

As mentioned above, conventional liquid crystal display panels.

If a line defect occurs in the bus line, the product will be defective and the manufacturing yield will be reduced. There was a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal display panel that solves this problem and improves manufacturing yield by preventing line defects caused by disconnection of bus lines.

[Means to solve the problem]

In order to achieve the above object, a liquid crystal display baffle according to the present invention includes a TFT substrate having a pixel electrode, a TFT element, a scan bus line and a data bus line for driving the rrFr element, and a common electrode. and a counter substrate on which a light shielding film is formed, and in which liquid crystal is sealed between the TFT substrate and the counter substrate and sealed with a seal, the light shielding film formed on the counter substrate is , is made of a conductive material, is electrically insulated from the common electrode, and is divided into a shape in which there is no part facing one or both of the two types of lotus lines provided on the TFT substrate. Each light-shielding film and the bus line closest to it are configured so that each set is electrically interconnected at both ends outside the display area 'M'.

[For production]

The principle of the present invention will be explained with reference to FIGS. 1 and 2.

In the present invention, the light shielding film 17 is made of conductive @! It is made of I material and is electrically insulated from the common electrode. Then, the TFT substrate 11 is divided into two types of bus lines, that is, the bus line A14 and the bus line B15.
), the light-shielding films 17a, 17b, and 17c are formed separately so that there are no portions facing the bus lines Al4a, 14b, 14c, and 14d formed on the TFT substrate 11.

Further, as shown in FIG. 2, each light shielding film 17a divided into one
, 17b, 17c and the closest bus lines 14b, 14
c, 14d outside the display area 18, the interconnection part 1!
Both ends of each set of ILa, 19b, 19c, 19d, 19e, and 19f are electrically interconnected.

Note that the bus line A14 formed on the TFT substrate 11
a, 14b, 14c, and 14d.
Even if 7 does not exist, bus lines A14a, 14b, 1
Since 4c and 14d themselves have light blocking properties, no leakage of light occurs and there is no problem.

FIG. 8 is a schematic diagram when a wire breakage occurs in the present invention.

In the figure, 71 is a liquid crystal display panel, 72 is a bus line, 73 is a broken line, 74 is a bra, ivy matrix, and 75
is the interconnect.

In the present invention, even if a disconnection occurs in the bus line 72 and a disconnection section 73 indicated by O occurs, the disconnection section 73 of the bus line 72
In the range indicated by D on the left side of 3.

Current is supplied from an external power source via interconnect 75a - black matrix 74 - interconnect 75b. As a result, the TFs connected to the range indicated by D on the bus line 72
The T element is driven even if a disconnection occurs. therefore,
Pixels in this range function normally.

As described above, in the liquid crystal display panel according to the second aspect of the present invention, line defects due to disconnections do not occur in the bus lines.

Therefore, according to the present invention, it is possible to improve the manufacturing yield of liquid crystal display panels.

〔Example〕

(First Embodiment) FIG. 1 is a diagram showing a first embodiment (Part 1) of the present invention. The figure (a) is a TFT substrate, the figure (b) is a counter substrate,
FIG. 1C shows a liquid crystal display panel in which a TFT substrate and a counter substrate are bonded together.

In the figure, 11 is a TFT substrate, 12 is a pixel electrode, 1
3 is a TFT element, 14 is a bus line A15, bus line 8, 16 is a counter substrate, and 17 is a black matrix (light shielding film).

In this example, the black matrix 17 is made of Cr. Then, blank matrices 17a, 17b,
It was divided into 17c.

FIG. 2 is a diagram showing the first embodiment (Part 2) of the present invention, and shows how the Frank matrix and the bus lines are interconnected.

The divided black matrices 17a, 17 sides 17c and the nearest bus lines A14b, 14c14d are connected to each other at interconnection parts 19a 19b 1 outside the display area 18.
Each set of 9c, 19d, 19e, and 19f was electrically interconnected at both ends.

(Second Embodiment) FIG. 3 is a diagram showing a second embodiment of the present invention. In this embodiment, the disconnection measures according to the present invention are applied to both the vertically running bus line and the horizontally running bus line. This is what I learned.

3A corresponds to the bus line A14 of the first embodiment. Portions 22a, 2 corresponding to bus lines running in the vertical direction
Black matrix A divided so that 2b does not exist
21a, 21b, and 21c are shown. Reference numeral 23 denotes an opening 24 having a shape corresponding to the pixel electric bridge and a notch provided in a portion corresponding to a bus line running in the horizontal direction. The cut portion 24 may not be provided.

FIG. 5B corresponds to the bus line BI5 of the first embodiment. Portions 25a, 2 corresponding to bus lines running in the horizontal direction
Blank matrices B25a and 25b formed so as to exist only in 5b are shown.

The same figure (C) shows the blank matrix A21 of the same figure (a).
A, 21b, 21c and the black matrices B25a, 25b of FIG. 3(b) are shown superimposed.

A secondary method was used as a forming method in this example.

(1) As shown in FIG. 3(d), C on the counter substrate 26
An insulating layer 2 made of polyimide, acrylic resin, SiN, etc. is formed on the entire surface of the black matrix A21 made of R, etc.
7 and then a black matrix B25 made of Cr or the like is formed thereon.

(2) As shown in FIG. 3(e), C on the counter substrate 26
A method of forming an insulating layer 27 made of polyimide, acrylic resin, SiN, etc. on a portion of a blank matrix A21 made of r, etc. where a black matrix B25 is to be formed, and forming a black matrix B25 made of Cr etc. thereon.

<Example of Interconnection> Next, a method of interconnecting the black matrix and the bus lines will be explained.

(Interconnection example (part 1)) FIG. 4 is a diagram showing an example of interconnection (part 1).

In this example, the bus line and the black matrix are connected via a spherical conductive spacer outside the seal.

In the figure, 30 is a substrate, and 31 is a TFT substrate.

32 is a bus line, 33 is a display area consisting of a liquid crystal, 3
4 is a seal, 35 is a conductive spacer, 36 is a counter substrate,
37 is a black matrix.

As shown in FIG. 4(a), conductive spacers 35 having the same diameter d as the cell thickness d are spread outside the display area 33 on one of the TFT substrates or the counter substrate 30, and then Spread insulating spacers over the entire surface to control cell thickness. Then, the TFT substrate 31 and the counter substrate 36 are bonded together using a seal 34, and the bus lines 32 formed on the TFT substrate 31 and the blank matrix 37 formed on the counter substrate 36 are electrically connected using conductive spacers 35. Connecting.

The spherical conductive spacer 35 is made of 5, for example, Au-PN.
Consists of i. Uses "Microbar" manufactured by Blockbuster Fine Chemicals.

Moreover, since the single spherical conductive spacer 35 has electrical anisotropy, even if it is connected in a row, adjacent bus lines will not be short-circuited.

(Interconnection example (part 2)) FIG. 5 is a diagram showing an example of interconnection (Part 2).

In this example, the outside of the seal for one or both of the bus line and black matrix is formed thicker than the inside of the seal, the TFT substrate and the other substrate are bonded together, and then laser light is irradiated. This is an example in which a bus line and a black matrix are electrically connected by fusing.

In the figure, 41 is a TFT substrate, 42 is a display area consisting of a liquid crystal display line 243, 44 is a seal, 4
5 is a counter substrate, 46 is a blank matrix, and 47 is a laser beam.

In this example, the film thickness on the outside of the seal 44 of one or both of the lotus line 42 and the black matrix 46 is formed to be thicker than on the inside of the seal 44. That is, the film thickness on the outside of the seal 44 of the bus line 42 is set to d2.
If the film thickness of the black matrix 46 outside the seal 44 is d, and the cell thickness is d, then d, +d, L:d holds true.

After bonding the TFT substrate 41 and the counter substrate 45, the bus line 42 and/or the flexible matrix 4
The bus line 42 and the blank matrix 46 are electrically connected by irradiating the outer thick part of the seal 44 of No. 6 with a laser beam 47 to fuse the bus line 42 and the blank matrix 46.

(Interconnection example (part 3)) FIG. 6 is a diagram showing an example of interconnection (No. 3).

In this example, the film thickness on the outside of the seal for one or both of bus line and black matrix is formed slightly thicker than the inside of the seal, and after bonding the TFT substrate and the counter substrate, one spherical conductive spacer is formed. This is an example in which the bus line and the black matrix are electrically connected by being fused together through the bus line.

In the figure, 51 is a TFT substrate, 52 is a cross line, 53 is a liquid crystal display area 254 is a seal, and 55
56 is a conductive spacer, and the counter substrate 57 is a black matrix.

In this example, the outside of the seal 54 of one or both of the bus line 52 and the black matrix 57 is formed to be slightly thicker than the inside of the seal 54. In other words, the film thickness on the outside of the seal 54 of the lotus line 52 is d
z, If the film thickness of the black matrix 57 outside the seal 54 is dl, and the cell thickness is d, then d, +d2<d holds true.

Furthermore, if the diameter of the conductive spacer 55 is d, d, +d, +d, =d holds true.

First, in the case of an example in which conductive spacers 55 with a diameter d are scattered outside the display area 53 on the TFT substrate 51 or the counter substrate 56, since d<d, one display area 53
Even if the conductive spacers 55 are present within the display area 53, a short circuit will not occur within the display area 53. Therefore, unlike the interconnection example (part 1) shown in FIG. It doesn't matter.

After that, insulating spacers for cell thickness control are spread over the entire surface. Then, the TFT substrate 51 and the counter substrate 56 are sealed with a seal 5.
4, and the bus line 52 formed on the TFT substrate 51 and the black matrix 57 formed on the counter substrate 56 are electrically connected by the conductive spacer 55.

As the spherical conductive spacer 55, for example, one example is used.

It consists of Au'PNi. Uses "Microbar" manufactured by Blockbuster Fine Chemicals.

Further, since the single spherical conductive spacer 55 has electrical anisotropy, even if it is connected in a row, adjacent bus lines will not be short-circuited.

[Effects of the Invention] According to the present invention, it is possible to prevent line defects caused by disconnection of bus lines in a liquid crystal display panel.

Therefore, it becomes possible to improve the manufacturing yield of liquid crystal display panels.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the first embodiment (part 1). FIG. 2 is a diagram showing the first embodiment (Part 2); FIG. 3 is a diagram showing the second embodiment. FIG. 4 is a diagram showing an example of interconnection (Part 1); FIG. 5 is a diagram showing an example of interconnection (Part 2). Fig. 6 shows an example of interconnection (part 3) Fig. 7 is a schematic diagram of a conventional example when ordering a disconnection Fig. 8 is a schematic diagram of the present invention when a disconnection occurs Fig. 9 is a diagram showing a conventional example be. In FIGS. 1 and 2, 11: TFT substrate 12: M elementary electrode 13: TFT element 14: Bus line A 15: Bus line B 16 Two opposing substrates 17: Black matrix (light shielding film) 1st: Display area 19: interconnection

Claims (1)

[Claims] A TFT comprising a pixel electrode (12), a TFT element (13), and a scan canvas line (15) and a data bus line (14) for driving the TFT element (13).
It consists of an FT substrate (11) and a counter substrate (16) on which a common electrode and a light shielding film (17) are formed.
In an active matrix type liquid crystal display panel in which liquid crystal is sealed between the counter substrate (11) and the counter substrate (16) and sealed with a seal, the light shielding film (17) formed on the counter substrate (16) is made of a conductive material. It is electrically insulated from the common electrode, and the TFT
Two types of bus lines (14, 15) provided on the board (11)
The bus lines (14b, 14c, 14d) closest to each of the divided light shielding films (17a, 17b, 17c) are separated from each other. A liquid crystal display panel characterized in that both ends of each set are electrically interconnected outside the display area (18).